A hold pressure core plate valve radial seal control system

Abstract

The application relates to the technical field of pressure-maintaining coring, and provides a pressure-maintaining coring plate valve radial sealing control system, which comprises a pipe structure, a plate valve impact mechanism, a plate valve mechanism and a core inner pipe assembly. The plate valve impact mechanism is sleeved in the pipe structure and located above the plate valve mechanism and is elastically suspendedly connected with the pipe structure. The plate valve mechanism is connected with the pipe structure. The core inner pipe assembly is sleeved in the plate valve mechanism, the plate valve impact mechanism and the pipe structure and is elastically suspendedly connected with the plate valve impact mechanism. The pressure-maintaining coring plate valve sealing system provided by the application solves the sealing problem of the pressure-maintaining coring plate valve in a particle-containing mud environment through radial extrusion sealing.

Description

Technical Field

[0001] This application relates to the field of pressure-holding coring technology. In particular, it relates to a radial sealing control system for a pressure-holding coring plate valve. Background Technology

[0002] Pressure-holding coring is the only method for obtaining in-situ pressure-holding cores, which is beneficial for comprehensive qualitative or quantitative analysis of reservoir samples. For pressure-holding corers with plate valve seals, end-face sealing is usually used for compression sealing. However, if the pre-pressure at the end face is insufficient or if particles are present on the sealing end face (in a mud environment containing rock cuttings), it is difficult to establish an initial seal, affecting the success rate of pressure-holding coring. To address this issue, this invention provides a radial sealing control system for pressure-holding coring plate valves, solving the above-mentioned sealing technology problems and achieving better results. Summary of the Invention

[0003] This application provides a radial sealing control system for a pressure-holding core-reactor valve, which has a good sealing effect.

[0004] To achieve the above objectives, this application adopts the following technical solution:

[0005] This application provides a radial sealing control system for a pressure-holding core-reamer valve, comprising:

[0006] Pipe structure;

[0007] A plate valve impact mechanism is sleeved inside the tube structure and is elastically suspended from the tube structure.

[0008] A plate valve mechanism is connected to the lower part of the pipe structure, and part of the plate valve mechanism is located below the plate valve impact mechanism;

[0009] The core inner tube assembly is sleeved within the plate valve impact mechanism, the plate valve mechanism, and the tube structure, and the core inner tube assembly is elastically suspended from the plate valve impact mechanism.

[0010] During core sampling, the core inner tube assembly is housed within the plate valve mechanism, the plate valve impact mechanism, and the tube structure.

[0011] After coring is completed, the core inner tube assembly drives the plate valve impact mechanism to move upward relative to the tube structure along the axial direction. When the core inner tube assembly moves upward to above part of the plate valve mechanism, the internal part of the plate valve mechanism rotates and closes the internal channel, without forming a seal.

[0012] The core inner tube assembly drives the plate valve impact mechanism to move upward relative to the tube structure along the axial direction, and part of the plate valve impact mechanism slides downward relative to the tube structure along the axial direction to apply impact force and thrust to the plate valve mechanism, and the plate valve mechanism forms a radial compression seal.

[0013] In some embodiments, the plate valve mechanism includes:

[0014] A plate valve cavity connecting pipe is connected to the pipe structure and is located below the pipe structure;

[0015] A plate valve sealing joint is connected to the plate valve cavity connecting pipe and is located below the plate valve cavity connecting pipe. The inner wall of the plate valve sealing joint is provided with a sealing cone surface.

[0016] A plate valve, wherein the plate valve and the plate valve sealing joint are rotatably connected by a pin, and the plate valve has a plate valve conical surface on its periphery, and the plate valve conical surface has an installation groove;

[0017] A radial seal for a plate valve, wherein the radial seal for the plate valve is disposed within the mounting groove;

[0018] A reed, which is fixedly connected to the plate valve. During core sampling, when the core inner tube assembly is sleeved inside the plate valve sealing joint and the plate valve is upright, the reed contacts the plate valve cavity connecting pipe and pushes the plate valve to contact the core inner tube assembly; and / or, a torsion spring, which is mounted on a pin.

[0019] After coring is completed, when the core inner tube assembly is above the plate valve, the spring and / or the torsion spring push the plate valve to flip. The conical surface of the plate valve flips around the pin and approaches the sealing conical surface. The side of the radial seal of the plate valve close to the pin contacts the conical surface of the plate valve, while the side of the radial seal away from the pin does not contact the conical surface of the plate valve. No radial compression seal is formed, that is, the internal channel is closed and no seal is formed.

[0020] The core inner tube assembly drives the plate valve impact mechanism to move upward relative to the tube structure along the axial direction. Part of the plate valve impact mechanism slides downward relative to the tube structure along the axial direction to apply impact force and thrust to the plate valve. The side of the plate valve radial seal away from the pin shaft contacts the conical surface of the plate valve to form a radial compression seal.

[0021] In some embodiments, the plate valve impact mechanism includes:

[0022] The traction control section is elastically suspended and connected to the core inner tube assembly. The core inner tube assembly drives the traction control section to move upward along the axial direction.

[0023] The energy storage impact section includes:

[0024] The bottom portion of the traction control part is stacked and inserted into the punch pipe so that the top of the punch pipe is elastically suspended and connected to the pipe structure.

[0025] A drive spring is pre-compressed and sleeved on the outer wall of the punching tube. One end of the drive spring abuts against the tube structure, and the other end abuts against the punching tube.

[0026] After core sampling is completed, the core inner tube assembly drives the traction control part to move upward along the axial direction. The overlapping part of the traction control part and the energy storage impact part separates. The punching tube is disconnected from the tube structure. The drive spring drives the punching tube to move downward along the axial direction to apply external force to the plate valve mechanism.

[0027] In some embodiments, the flushing tube includes:

[0028] The punching tube body has a plurality of first slits on its top, and there is a notch between two adjacent first slits. The notches are arranged at equal intervals along the circumference of the punching tube body to form a first elastic part.

[0029] The first elastic suspension protrusion is fixedly connected to the first elastic part; when the bottom of the traction control part is inserted into the first elastic part, the traction control part constrains the first elastic part to undergo elastic deformation, and the first elastic suspension protrusion is radially expanded outward so that the tube structure of the first elastic suspension protrusion is elastically suspended.

[0030] The shoulder is located on the outer wall of the punching tube body near the bottom. The drive spring is sleeved on the outer wall of the punching tube body. One end of the drive spring abuts against the tube structure, and the other end abuts against the end face of the shoulder facing the first elastic suspension protrusion to pre-compress the drive spring.

[0031] In some embodiments, the traction control section includes a traction tube:

[0032] The traction pipe is elastically suspended from the core inner tube assembly;

[0033] The traction tube includes:

[0034] The traction tube body has a plurality of second slits at its top, with a notch between two adjacent second slits. The notches are evenly spaced at an angle along the circumference of the traction tube body to form a second elastic part.

[0035] The second elastic suspension protrusion is fixedly connected to the second elastic part;

[0036] When the traction tube is inserted into the tube structure and the core inner tube assembly is inserted into the traction tube, the tube structure constrains the second elastic part so that the second elastic part undergoes elastic deformation. The second elastic suspension protrusion is radially recessed so that the second elastic suspension protrusion is elastically suspended to the reduced diameter shoulder of the core inner tube assembly. The traction tube body and the core inner tube assembly are clearance-fitted, wherein the reduced diameter shoulder is provided on the outer wall of the core inner tube assembly.

[0037] When the traction tube is not inserted into the tube structure, the second elastic suspension protrusion expands outward under the action of the core inner tube assembly, so that the core inner tube assembly is inserted into the traction tube;

[0038] The suspension protrusion is fixedly connected to the outer wall of the traction tube body near the bottom.

[0039] In some embodiments, the traction control portion includes a release tube, the release tube comprising:

[0040] The release tube body has a plurality of third slits at its top, with a notch between two adjacent third slits. The notches are arranged at equal intervals along the circumference of the release tube body to form a third elastic part.

[0041] The third elastic suspension protrusion is fixedly connected to the third elastic part;

[0042] The release tube is inserted into the tube structure, and the third elastic suspension protrusion is radially recessed. The tube structure constrains the third elastic part to undergo elastic deformation so that the inner diameter of the third elastic suspension protrusion is smaller than the outer diameter of the suspension protrusion.

[0043] When the release tube is not inserted into the tube structure, the third elastic suspension protrusion expands outward under the action of the suspension protrusion so that the suspension protrusion is inserted into the release tube;

[0044] A reduced diameter section is fixedly connected to the bottom of the release tube body, and the reduced diameter section is inserted into the flushing tube in a stacked manner.

[0045] The core inner tube assembly drives the traction tube to move axially upward relative to the release tube until the suspension protrusion abuts against the third elastic suspension protrusion. The traction tube drives the release tube to move axially upward relative to the flushing tube. When the release tube moves upward and disengages from the flushing tube, the first elastic part of the flushing tube contracts, the first elastic suspension protrusion retracts radially inward, and the flushing tube disengages from the tube structure.

[0046] This application employs a tubular structure, a plate valve impact mechanism, an inner tube assembly, and a plate valve mechanism. The plate valve impact mechanism is fitted inside the tubular structure and is elastically suspended from it. The plate valve mechanism is connected to the lower part of the tubular structure, with a portion of it located below the impact mechanism. The inner core tube assembly is fitted inside the impact mechanism, the plate valve mechanism, and the tubular structure, and is elastically suspended from the impact mechanism. During core sampling, the inner core tube assembly is fitted inside the plate valve mechanism, the impact mechanism, and the tubular structure. After core sampling, the inner core tube assembly drives the plate valve impact mechanism to move axially upward relative to the tubular structure. When the inner core tube assembly moves above a portion of the plate valve mechanism, the internal portion of the plate valve mechanism rotates and closes the internal passage, failing to form a seal. The inner core tube assembly then drives the plate valve impact mechanism to move axially upward relative to the tubular structure, while a portion of the plate valve impact mechanism slides axially downward relative to the tubular structure to apply impact and thrust to the plate valve mechanism, creating a radial compression seal. Compared to related technologies where the plate valve mechanism only achieves sealing through pre-tightening force, this application can also apply external force to the plate valve mechanism to improve the sealing effect. Attached Figure Description

[0047] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0048] Figure 1 The first state schematic diagram of a portion of the pipe structure, a portion of the plate valve impact mechanism, a portion of the core inner tube assembly, and the plate valve structure in the radial sealing control system of the pressure-holding core sampling plate valve provided in the embodiments of this application.

[0049] Figure 2 for Figure 1 The second state intention of the structure;

[0050] Figure 3 for Figure 1 The third state intention of the structure;

[0051] Figure 4 for Figure 1 The fourth state intention of the structure;

[0052] Figure 5 for Figure 1 The fifth state intention of the structure;

[0053] Figure 6 for Figure 1 A magnified view of a section at point A in the middle;

[0054] Figure 7for Figure 5 A magnified view of a section at point B in the middle;

[0055] Figure 8 This is a schematic diagram of the core inner tube assembly in the radial sealing control system of the pressure-holding core plate valve provided in the embodiments of this application;

[0056] Figure 9 This is a schematic diagram of the traction control section in the radial sealing control system of the pressure-holding core-collecting valve provided in the embodiments of this application;

[0057] Figure 10 A schematic diagram showing the connection between the traction control section and the core inner tube assembly in the radial sealing control system of the pressure-holding core plate valve provided in this embodiment of the application;

[0058] Figure 11 for Figure 4 A magnified view of a section at point C.

[0059] Explanation of reference numerals in the attached figures:

[0060] 100 - Pipe structure; 110 - Short connector;

[0061] 200 - Valve impact mechanism; 210 - Traction control section; 211 - Traction pipe; 2111 - Traction pipe body; 2112 - Second elastic suspension protrusion; 2113 - Suspension protrusion; 2114 - Second elastic part; 212 - Release pipe; 2121 - Release pipe body; 2122 - Third elastic suspension protrusion; 2123 - Reduced diameter part; 2124 - Third elastic part; 220 - Energy storage impact section; 221 - Punch pipe; 2211 - Punch pipe body; 2212 - First elastic suspension protrusion; 2213 - Shoulder; 2214 - First elastic part; 222 - Drive spring;

[0062] 300 - Core inner tube assembly; 310 - Quick-connect male connector; 320 - Core inner tube assembly body; 321 - Reduced diameter shoulder; 330 - Core tube; 340 - Retaining spring; 350 - Second sealing part;

[0063] 400 - Plate valve mechanism; 410 - Plate valve cavity connecting pipe; 420 - Plate valve sealing joint; 421 - Sealing cone surface; 430 - Plate valve; 431 - Plate valve cone surface; 432 - Mounting groove; 440 - Plate valve radial seal; 450 - Pin; 460 - Spring;

[0064] 500-Drill bit. Detailed Implementation

[0065] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0066] In related technologies, for pressure-holding coring tools with plate valve seals, end face sealing rings are usually used for contact and compression sealing. However, if the pre-pressure of the end face contact is insufficient or there are particles on the sealing end face (in mud environments containing rock cuttings), it is difficult to establish an initial seal, which affects the success rate of pressure-holding coring.

[0067] To address this issue, the present invention provides a radial sealing control system for a pressure-holding coring plate valve. After pressure-holding coring is completed, when the core inner tube assembly moves to a preset position, the plate valve mechanism flips to cover the channel of the core inner tube assembly. Furthermore, the plate valve impact mechanism impacts the plate valve mechanism, pressing the plate valve mechanism into the sealing surface to form a radial compression seal, thereby establishing an effective initial seal, which is beneficial to improving the success rate of pressure-holding coring with the plate valve.

[0068] Specifically, this application involves a pipe structure, a plate valve impact mechanism, a core inner tube assembly, and a plate valve mechanism. The plate valve impact mechanism is located within the pipe structure and is slidably connected to it. The plate valve impact mechanism is sleeved within the pipe structure and is elastically suspended from it. The plate valve mechanism is connected to the lower part of the pipe structure, with a portion of it located below the impact mechanism. The core inner tube assembly is sleeved within the impact mechanism, the plate valve mechanism, and the pipe structure, and is elastically suspended from it. During core sampling, the core inner tube assembly is sleeved within the plate valve mechanism, the impact mechanism, and the pipe structure. After core sampling, the core inner tube assembly drives the plate valve impact mechanism to move axially upward relative to the pipe structure. When the core inner tube assembly moves above a portion of the plate valve mechanism, the internal portion of the plate valve mechanism rotates and closes its internal passage, thus preventing a seal from forming. The core inner tube assembly drives the plate valve impact mechanism to move upward along the axial direction relative to the tube structure, while a portion of the plate valve impact mechanism slides downward along the axial direction relative to the tube structure to apply impact and thrust to the plate valve mechanism, forming a radial compression seal. Compared to related technologies where the plate valve mechanism only forms an end-face contact seal between the plate valve and the plate valve sealing joint through torsion spring preload, this application further applies external force to the plate valve mechanism to achieve a radial compression seal between the plate valve and the plate valve sealing joint, changing the sealing method and improving the sealing success rate in downhole particulate environments.

[0069] The contents of this application will now be described in detail with reference to the accompanying drawings, so that those skilled in the art can have a clearer and more detailed understanding of the contents of this application.

[0070] This application provides a radial sealing control system for a pressure-holding coring plate valve, which is part of a pressure-holding coring tool. The pressure-holding coring tool is housed inside an outer tube, and the outer tube drives the pressure-holding coring tool to rotate and advance, thereby performing coring. Exemplarily, the pressure-holding coring tool can be lowered into the outer tube at the bottom of the well via a rope or directly deployed.

[0071] In this embodiment, the pressure-holding coring tool includes a differential control section and a core pressure-holding section.

[0072] The differential control section is used to achieve axial limiting connection between the pressure-holding coring tool and the outer tube, and to achieve in-situ pressure-holding and sealing of the core pressure-holding section at the bottom of the well after coring. The differential control section and the core pressure-holding section are connected axially vertically.

[0073] See Figures 1 to 7 As shown, specifically, the core pressure-maintaining part includes: a pipe structure 100, a plate valve impact mechanism 200, a core inner pipe assembly 300, and a plate valve mechanism 400.

[0074] The pipe structure 100 includes a short connector 110.

[0075] The plate valve impact mechanism 200 is sleeved inside the pipe structure 100, and the plate valve impact mechanism 200 is elastically suspended from the pipe structure 100.

[0076] Among them, the plate valve mechanism 400 is connected to the lower part of the pipe structure 100, and part of the plate valve mechanism 400 is located below the plate valve impact mechanism 200.

[0077] The core inner tube assembly 300 is housed within the plate valve impact mechanism 200, the plate valve mechanism 400, and the tube structure 100. The core inner tube assembly 300 is elastically suspended from the plate valve impact mechanism 200.

[0078] During core sampling, the core inner tube assembly 300 is installed inside the plate valve mechanism 400, the plate valve impact mechanism 200, and the tube structure 100;

[0079] After coring is completed, the core inner tube assembly 300 drives the plate valve impact mechanism 300 to move upward relative to the tube structure 100 along the axial direction. When the core inner tube assembly 300 moves upward to above part of the plate valve mechanism 400, the internal part of the plate valve mechanism 400 rotates and closes the internal channel, without forming a seal.

[0080] The core inner tube assembly 300 drives the plate valve impact mechanism 200 to move upward relative to the tube structure 100 along the axial direction. Part of the plate valve impact mechanism 200 slides downward relative to the tube structure 100 along the axial direction to apply impact force and thrust to the plate valve mechanism 400, and the plate valve mechanism 400 forms a radial compression seal.

[0081] Understandably, the plate valve impact mechanism 200 slides axially downward relative to the pipe structure 100 to apply external force to the plate valve mechanism 400, thereby sealing the bottom of the core inner tube assembly 300 through the action of the external force. Compared with the related technology where the plate valve mechanism 400 only achieves the end face contact seal between the plate valve 430 and the plate valve sealing joint 420 through the torsion spring preload, this application can also apply additional external force to the plate valve mechanism 400 to achieve radial compression seal between the plate valve 430 and the plate valve sealing joint 420, thereby improving the sealing success rate.

[0082] The specific structure of the core inner tube assembly 300 is described below.

[0083] See Figure 8 As shown, the core inner tube assembly 300 includes a quick-connect male connector 310, a core inner tube assembly body 320, a core tube 330, and a retaining spring 340. The core tube 330 can be a plastic core tube. The quick-connect male connector 310 is located at the top of the core inner tube assembly body 320 and is connected to it. The core tube 330 is located at the bottom of the core inner tube assembly body 320 and is connected to it. The retaining spring 340 is located at the bottom of the core tube 330 and is connected to it.

[0084] A second sealing part 350 is provided on the outer wall of the core inner tube body 320.

[0085] A reduced-diameter shoulder 321 is provided on the outer wall of the core inner tube body 320.

[0086] It should be noted that the core inner tube assembly 320 may include the commonly used structure of the pressure-holding section inner tube assembly in related technologies. This embodiment does not limit the specific structure of the core inner tube assembly 320.

[0087] The specific structure of the plate valve impact mechanism 200 is described below.

[0088] See Figure 9 and Figure 10 As shown, in some embodiments, the plate valve impact mechanism 200 includes a traction control section 210 and an energy storage impact section 220.

[0089] The traction control unit 210 is elastically suspended from the core inner tube assembly 300, and the core inner tube assembly 300 drives the traction control unit 210 to move upward along the axial direction.

[0090] See Figures 1 to 6 As shown, the energy storage impact section 220 includes: a punch tube 221 and a drive spring 222.

[0091] The bottom part of the traction control part 210 is inserted into the punch pipe 221 so that the top of the punch pipe 221 is elastically suspended and connected to the pipe structure 100.

[0092] The drive spring 222 is pre-pressed and sleeved on the outer wall of the punch tube 221. One end of the drive spring 222 abuts against the tube structure 100, and the other end abuts against the tube structure 100.

[0093] After core sampling is completed, the core inner tube assembly 300 drives the traction control part 210 to move upward along the axial direction. The overlapping part of the traction control part 210 and the energy storage impact part 220 separates, the punching tube 221 is disconnected from the tube structure 100, and the drive spring 222 drives the punching tube 221 to move downward along the axial direction to apply external force to the plate valve mechanism 400.

[0094] Specifically, the punch 221 moves downward along the axial direction, generating an impact force on the plate valve mechanism 400, thereby making the plate valve mechanism 400 fit tightly against the inner wall of the pipe structure 100, improving the reliability of the seal, and making it less susceptible to the influence of particulate impurities on the contact surface.

[0095] In some embodiments, the punch 221 includes: a punch body 2211, a first elastic suspension protrusion 2212, a shoulder 2213, and a first elastic portion 2214.

[0096] The top of the punch body 2211 is provided with a plurality of first slits, and there is a notch between two adjacent first slits. The notches are provided at equal intervals along the circumference of the punch body 2211 to form a first elastic part 2214.

[0097] The first elastic suspension protrusion 2212 is fixedly connected to the outer wall of the first elastic part 2214. When the bottom of the traction control part 210 is inserted into the first elastic part 2214, the traction control part 210 constrains the first elastic part 2214 to undergo elastic deformation, and the first elastic suspension protrusion 2212 is arranged to expand radially outward so that the first elastic suspension protrusion 2212 is elastically suspended and connected to the tube structure 100.

[0098] The shoulder portion 2213 is located on the outer wall of the punching tube body 2211 near the bottom. The drive spring 222 is sleeved on the outer wall of the punching tube body 2211. One end of the drive spring 222 abuts against the tube structure 100, and the other end abuts against the end face of the shoulder portion 2213 facing the first elastic suspension protrusion 2212, so as to pre-compress the drive spring 222.

[0099] It is understandable that the structure of the punch tube 221 provided in this embodiment is relatively simple and the processing difficulty is relatively low.

[0100] In some embodiments, the traction control section 210 includes a traction pipe 211, which is elastically suspended to the core inner tube assembly 300.

[0101] In some embodiments, the traction tube 211 includes: a traction tube body 2111, a second elastic suspension protrusion 2112, a suspension protrusion 2113, and a second elastic portion 2114.

[0102] The top of the traction tube body 2111 is provided with a plurality of second slits, and there is a notch between two adjacent second slits. The notches are provided at equal intervals along the circumference of the traction tube body 2111 to form a second elastic part 2114.

[0103] The second elastic suspension protrusion 2112 is fixedly connected to the second elastic part 2114.

[0104] When the traction tube 211 is inserted into the tube structure 100 and the core inner tube assembly 300 is inserted into the traction tube 211, the tube structure 100 constrains the second elastic part 2114 so that the second elastic part 2114 undergoes elastic deformation. The second elastic suspension protrusion 2112 is radially recessed so that the second elastic suspension protrusion 2112 is elastically suspended to the reduced diameter shoulder 321 of the core inner tube assembly 300, and the traction tube body 2111 and the core inner tube assembly 300 are clearance-fitted.

[0105] When the traction pipe 211 is not inserted into the pipe structure 100, the second elastic suspension protrusion 2112 expands outward under the action of the core inner pipe assembly 300 so that the core inner pipe assembly 300 is inserted into the traction pipe 211.

[0106] The suspension protrusion 2113 is fixedly connected to the outer wall of the traction tube body 2111 near the bottom.

[0107] In some embodiments, the traction control section 210 includes a release tube 212.

[0108] In some embodiments, the release tube 212 includes a release tube body 2121, a third elastic suspension protrusion 2122, a reduced diameter portion 2123, and a third elastic portion 2124.

[0109] The top of the release tube body 2121 is provided with a plurality of third slits, and there is a notch between two adjacent third slits. The notches are provided at equal intervals along the circumference of the release tube body 2121 to form a third elastic part 2124.

[0110] The third elastic suspension protrusion 2122 is fixedly connected to the third elastic part 2124.

[0111] The release tube 212 is inserted into the tube structure 100. The third elastic suspension protrusion 2122 is radially recessed. The tube structure 100 constrains the third elastic part 2124 to undergo elastic deformation so that the inner diameter of the third elastic suspension protrusion 2122 is smaller than the outer diameter of the suspension protrusion 2113.

[0112] When the release tube 212 is not inserted into the tube structure 100, the third elastic suspension protrusion 2122 expands outward under the action of the suspension protrusion 2113 so that the suspension protrusion is inserted into the release tube 212.

[0113] The reduced diameter section 2123 is fixedly connected to the bottom of the release tube body 2121, and the reduced diameter section 2123 is inserted into the flushing tube 221.

[0114] The core inner tube assembly 300 drives the traction tube 211 to move axially upward relative to the release tube 212 until the suspension protrusion abuts against the third elastic suspension protrusion 2122. The traction tube 211 drives the release tube 212 to move axially upward relative to the flushing tube 221. When the release tube 212 moves upward until it disengages from the flushing tube 221, the first elastic part 2214 of the flushing tube 221 contracts, the first elastic suspension protrusion 2212 retracts radially inward, and the flushing tube 221 disengages from the tube structure 100.

[0115] The specific structure of the plate valve mechanism 400 is described below.

[0116] See Figure 7 and Figure 11 As shown, in some embodiments, the plate valve mechanism 400 includes a plate valve cavity connecting pipe 410, which is connected to the pipe structure and located below the pipe structure 100.

[0117] The plate valve mechanism 400 includes a plate valve sealing joint 420, which is connected to and located below the plate valve cavity connecting pipe 410. The plate valve sealing joint 420 is connected to the drill bit 500.

[0118] For example, the short connector 110 and the plate valve cavity connecting pipe 410 are connected by pipe threads. A first sealing element is provided between the short connector 110 and the plate valve cavity connecting pipe 410 for sealing. The plate valve cavity connecting pipe 410 and the plate valve sealing joint 420 are connected by pipe threads. A third sealing element is provided between the plate valve cavity connecting pipe 410 and the plate valve sealing joint 420 for sealing.

[0119] The inner wall of the plate valve sealing joint 420 is provided with a sealing cone surface 421. Along the axial direction, from top to bottom, the radial dimension of the sealing cone surface 421 gradually decreases.

[0120] The plate valve mechanism 400 includes a plate valve 430, which is rotatably connected to a plate valve sealing joint 420 via a pin 450. A plate valve conical surface 431 is provided on the periphery of the plate valve 430. Along the axial direction, from top to bottom, the radial dimension of the plate valve conical surface 431 gradually increases.

[0121] The valve cone surface 431 is provided with a mounting groove 432.

[0122] The plate valve mechanism 400 includes a plate valve radial seal 440, which is disposed in the mounting groove 432.

[0123] The plate valve mechanism 400 includes a spring 460, which is fixedly connected to the plate valve 430. During core sampling, the core inner tube assembly 300 is fitted inside the plate valve sealing joint 420, and when the plate valve 430 is upright, the spring 460 contacts the plate valve cavity connecting pipe 410, and pushes the plate valve 430 to contact the core inner tube assembly 300.

[0124] And / or, the plate valve mechanism 400 includes a torsion spring disposed on a pin 450.

[0125] It should be noted that the valve mechanism 400 may include a reed 460, or the valve mechanism 400 may include a torsion spring. Alternatively, the valve mechanism 400 may include both a reed 460 and a torsion spring. Alternatively, the valve mechanism 400 may include other elastic elements that can provide elasticity, such as elastic rubber.

[0126] After coring is completed, when the core inner tube assembly 300 is above the plate valve 430, the reed 460 and / or torsion spring push the plate valve 430 to flip. The plate valve cone surface 431 flips around the pin 450 and approaches the sealing cone surface 421. The side of the plate valve radial seal 440 near the pin 450 contacts the plate valve cone surface 431, while the side of the plate valve radial seal 440 away from the pin 450 does not contact the plate valve cone surface 431. No radial compression seal is formed, that is, the internal channel is closed and no seal is formed.

[0127] It should be noted that the plate valve 430 can be flipped under the elastic force of the reed 460. Alternatively, the plate valve 430 can be flipped under the elastic force of the torsion spring. Or, the plate valve 430 can be flipped under the combined elastic force of the reed 460 and the torsion spring.

[0128] The core inner tube assembly 300 drives the plate valve impact mechanism 200 to move upward relative to the tube structure 100 along the axial direction. Part of the plate valve impact mechanism 200 slides downward relative to the tube structure 100 along the axial direction to apply impact and thrust to the plate valve 430. The side of the plate valve radial seal 440 away from the pin 450 contacts the plate valve conical surface 431, forming a radial compression seal. In this case, the plate valve radial seal 440 is in a state of being compressed and deformed for sealing.

[0129] See Figures 1 to 7 As shown below, the working process of the radial sealing control system of the pressure-holding core-collecting valve is explained:

[0130] During core sampling, the plate valve mechanism 400 is located between the core inner tube assembly 300 and the tube structure 100. The core inner tube assembly 300 compresses the plate valve mechanism 400, bringing the plate valve mechanism 400 closer to the inner wall of the tube structure 100.

[0131] After coring, the core inner tube assembly 300 drives the traction tube 211 to move axially upward relative to the release tube 212. When the core inner tube assembly 300 is above the plate valve 430, the spring 460 and / or torsion spring push the plate valve 430 to flip. The plate valve cone surface 431 flips around the pin 450 and approaches the sealing cone surface 421. The side of the plate valve radial seal 440 close to the pin 450 contacts the plate valve cone surface 431, while the side of the plate valve radial seal 440 away from the pin 450 does not contact the plate valve cone surface 431. No radial compression seal is formed, i.e., the initial seal.

[0132] Then, the core inner tube assembly 300 drives the traction tube 211 to move axially upward relative to the release tube 212 until the suspension protrusion 2113 abuts against the third elastic suspension protrusion 2122. The traction tube 211 drives the release tube 212 to move axially upward relative to the flushing tube 221. When the release tube 212 moves upward to disengage from the flushing tube 221, the first elastic part 2214 of the flushing tube 221 contracts, the first elastic suspension protrusion 2212 retracts radially inward, and the flushing tube 221 disengages from the tube structure 100.

[0133] The punch 221 slides downward along the axial direction relative to the pipe structure 100 to apply impact and thrust to the plate valve 430. The side of the plate valve radial seal 440 away from the pin 450 contacts the plate valve cone surface 431 to form a radial compression seal. In this case, the plate valve radial seal 440 is in a state of being compressed and deformed for sealing.

[0134] It should be noted that the terms "one embodiment," "embodiment," "exemplary embodiment," "some embodiments," etc., mentioned in the specification indicate that the described embodiment may include a specific feature, structure, or characteristic, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Moreover, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not, is within the knowledge scope of those skilled in the art.

[0135] Generally speaking, terms should be understood at least in part by their use in context. For example, at least in part by context, the term "one or more" as used in the text can be used to describe any feature, structure, or characteristic of the singular meaning, or a combination of features, structures, or characteristics of the plural meaning. Similarly, at least in part by context, terms such as "a" or "the" can also be understood to convey either singular or plural usage.

[0136] It should be readily understood that the terms “on,” “above,” and “on top of” in this application should be interpreted in the broadest possible sense, such that “on” means not only “directly on something” but also “on something” with an intermediate feature or layer therebetween, and that “above” or “on top of” means not only “on something” but also “on something” without an intermediate feature or layer therebetween (i.e., directly on something).

[0137] Furthermore, for ease of explanation, spatially relative terms such as "below," "below," "under," "above," and "above" may be used to describe the relationship of one element or feature relative to other elements or features as shown in the figures. Spatially relative terms are intended to encompass different orientations of the device in use or operation other than those shown in the figures. The device may have other orientations (rotated 90° or in other orientations), and the spatially relative descriptive terms used herein may be interpreted accordingly.

[0138] It should be noted that the brief descriptions of terms in this application are only for the convenience of understanding the embodiments described below, and are not intended to limit the embodiments of this application. Unless otherwise stated, these terms should be understood in their ordinary and common meaning.

[0139] Furthermore, the terms “comprising” and “having”, and any variations thereof, are intended to cover but not exclusively include, for example, a product or device that includes a series of components is not necessarily limited to those that are explicitly listed, but may include other components that are not explicitly listed or that are inherent to such product or device.

[0140] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0141] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0142] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0143] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A radial sealing control system for a pressure-holding core-reactor valve, characterized in that, include: Tube structure (100); A plate valve impact mechanism (200) is sleeved inside the tube structure (100), and the plate valve impact mechanism (200) is elastically suspended from the tube structure (100). A plate valve mechanism (400) is connected to the lower part of the pipe structure (100), and part of the plate valve mechanism (400) is located below the plate valve impact mechanism (200); Core inner tube assembly (300), the core inner tube assembly (300) is sleeved in the plate valve impact mechanism (200), the plate valve mechanism (400) and the tube structure (100), the core inner tube assembly (300) and the plate valve impact mechanism (200) are elastically suspended and connected; During core sampling, the core inner tube assembly (300) is fitted inside the plate valve mechanism (400), the plate valve impact mechanism (200), and the tube structure (100); After coring is completed, the core inner tube assembly (300) drives the plate valve impact mechanism (200) to move upward relative to the tube structure (100) along the axial direction. When the core inner tube assembly (300) moves upward to above part of the plate valve mechanism (400), the internal part of the plate valve mechanism (400) rotates to close the internal channel, and no seal is formed. The core inner tube assembly (300) drives the plate valve impact mechanism (200) to move upward relative to the tube structure (100) along the axial direction. Part of the plate valve impact mechanism (200) slides downward relative to the tube structure (100) along the axial direction to apply impact force and thrust to the plate valve mechanism (400). The plate valve mechanism (400) forms a radial compression seal. The plate valve mechanism (400) includes: A plate valve cavity connecting pipe (410) is connected to the pipe structure (100) and is located below the pipe structure (100); A plate valve sealing joint (420) is connected to the plate valve cavity connecting pipe (410) and is located below the plate valve cavity connecting pipe (410). The inner wall of the plate valve sealing joint (420) is provided with a sealing cone surface (421). A plate valve (430) is rotatably connected to a plate valve sealing joint (420) via a pin (450). A plate valve cone surface (431) is provided on the periphery of the plate valve (430), and an installation groove (432) is provided on the plate valve cone surface (431). A radial seal (440) for a plate valve is disposed within the mounting groove (432); A reed (460) is fixedly connected to a plate valve (430). During core sampling, the core inner tube assembly (300) is sleeved inside the plate valve sealing joint (420), and when the plate valve (430) is upright, the reed (460) contacts the plate valve cavity connecting pipe (410) and pushes the plate valve (430) to contact the core inner tube assembly (300); and / or, a torsion spring is provided on a pin (450); After core sampling, when the core inner tube assembly (300) is above the plate valve (430), the reed (460) and / or the torsion spring push the plate valve (430) to flip. The plate valve cone (431) flips around the pin (450) and approaches the sealing cone (421). The side of the plate valve radial seal (440) close to the pin (450) contacts the plate valve cone (431), and the side of the plate valve radial seal (440) away from the pin (450) does not contact the plate valve cone (431). No radial compression seal is formed, that is, the internal channel is closed and no seal is formed. The core inner tube assembly (300) drives the plate valve impact mechanism (200) to move upward relative to the tube structure (100) along the axial direction. Part of the plate valve impact mechanism (200) slides downward relative to the tube structure (100) along the axial direction to apply impact force and thrust to the plate valve (430). The side of the plate valve radial seal (440) away from the pin (450) contacts the plate valve cone surface (431) to form a radial compression seal.

2. The radial sealing control system for the pressure-holding core-taking plate valve according to claim 1, characterized in that, The plate valve impact mechanism (200) includes: The traction control part (210) is elastically suspended to the core inner tube assembly (300), and the core inner tube assembly (300) drives the traction control part (210) to move upward along the axial direction; An energy storage shock section (220) comprising: The bottom portion of the traction control part (210) is inserted into the punch pipe (221) so that the top of the punch pipe (221) is elastically suspended and connected to the pipe structure (100); A drive spring (222) is pre-pressed and sleeved on the outer wall of the punch (221). One end of the drive spring (222) abuts against the tube structure (100), and the other end abuts against the punch (221). After core sampling is completed, the core inner tube assembly (300) drives the traction control part (210) to move upward along the axial direction. The overlapping part of the traction control part (210) and the energy storage impact part (220) separates. The punching tube (221) is disconnected from the tube structure (100). The driving spring (222) drives the punching tube (221) to move downward along the axial direction to apply external force to the plate valve mechanism (400).

3. The radial sealing control system for the pressure-holding core-taking plate valve according to claim 2, characterized in that, The punch (221) includes: The punch body (2211) has a plurality of first slits on its top, and there is a notch between two adjacent first slits. The notches are arranged at equal intervals along the circumference of the punch body (2211) to form a first elastic part (2214). The first elastic suspension protrusion (2212) is fixedly connected to the outer wall of the first elastic part (2214); when the bottom of the traction control part (210) is inserted into the first elastic part (2214), the traction control part (210) constrains the first elastic part (2214) to undergo elastic deformation, and the first elastic suspension protrusion (2212) is radially expanded outward so that the first elastic suspension protrusion (2212) is elastically suspended from the tube structure (100); A shoulder (2213) is provided on the outer wall of the punch body (2211) near the bottom. A drive spring (222) is sleeved on the outer wall of the punch body (2211). One end of the drive spring (222) abuts against the tube structure (100), and the other end abuts against the end face of the shoulder (2213) facing the first elastic suspension protrusion (2212) to pre-compress the drive spring (222).

4. The radial sealing control system for the pressure-holding core-taking plate valve according to claim 3, characterized in that, The traction control section (210) includes a traction pipe (211): The traction pipe (211) is elastically suspended from the core inner tube assembly (300); The traction tube (211) includes: The top of the traction tube body (2111) is provided with a plurality of second slits, and there is a notch between two adjacent second slits. The notches are provided at equal intervals along the circumference of the traction tube body (2111) to form a second elastic part (2114). The second elastic suspension protrusion (2112) is fixedly connected to the second elastic part (2114); When the traction tube (211) is inserted into the tube structure (100) and the core inner tube assembly (300) is inserted into the traction tube (211), the tube structure (100) constrains the second elastic part (2114) so ​​that the second elastic part (2114) undergoes elastic deformation. The second elastic suspension protrusion (2112) is radially recessed so that the second elastic suspension protrusion (2112) is elastically suspended and connected to the reduced diameter shoulder (321) of the core inner tube assembly (300). The traction tube body (2111) is clearance-fitted with the core inner tube assembly (300), wherein the reduced diameter shoulder (321) is provided on the outer wall of the core inner tube assembly (300). When the traction tube (211) is not inserted into the tube structure (100), the second elastic suspension protrusion (2112) expands outward under the action of the core inner tube assembly (300) so that the core inner tube assembly (300) is inserted into the traction tube (211); The suspension protrusion (2113) is fixedly connected to the outer wall of the traction tube body (2111) near the bottom.

5. The radial sealing control system for the pressure-holding core-taking plate valve according to claim 4, characterized in that, The traction control unit (210) includes a release tube (212), which includes: The release tube body (2111) has a plurality of third slits on its top, and there is a notch between two adjacent third slits. The notches are arranged at equal intervals along the circumference of the release tube body (2111) to form a third elastic part (2124). The third elastic suspension protrusion (2122) is fixedly connected to the third elastic part (2124); The release tube (212) is inserted into the tube structure (100), the third elastic suspension protrusion (2122) is radially recessed, and the tube structure (100) constrains the third elastic part (2124) to undergo elastic deformation so that the inner diameter of the third elastic suspension protrusion (2122) is smaller than the outer diameter of the suspension protrusion (2113); When the release tube (212) is not inserted into the tube structure (100), the third elastic suspension protrusion (2122) expands outward under the action of the suspension protrusion (2113) so that the suspension protrusion (2113) is inserted into the release tube (212); A reduced diameter section (2123) is fixedly connected to the bottom of the release tube body (2111), and the reduced diameter section (2123) is inserted into the flushing tube (221). The core inner tube assembly (300) drives the traction tube (211) to move axially upward relative to the release tube (212) until the suspension protrusion (2113) abuts against the third elastic suspension protrusion (2122). The traction tube (211) drives the release tube (212) to move axially upward relative to the flushing tube (221). When the release tube (212) moves upward to disengage from the flushing tube (221), the first elastic part (2214) of the flushing tube (221) contracts, the first elastic suspension protrusion (2212) retracts radially inward, and the flushing tube (221) disengages from the tube structure (100).

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